VS - Lighting Systems - Lighting - 998542

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Halogen lamps The Halogen technology is an improvement of the historical tungsten incandescent lamps. It is widely used in automotive applications for lighting and signalling. Compared to their Tungsten predecessors, Halogen bulbs are not sensitive to “blackening of the light bulb glass”. Halogen bulbs stay clear, achieving a longer service life. 10.1. Halogen regenerative cycle The combination of the Halogen gas and the tungsten filament produces a regenerative reaction which deposits evaporated tungsten back onto the filament, increasing its life and maintaining the clarity of the bulb glass for a higher luminous efficiency.

The Halogen regenerative cycle

Tungsten atom

Halogen atom

Oxygen atom

Tungsten filament vaporization (a)

Formation of tungsten oxyhalide (b)

Tungsten deposited on filament (c)

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